DS Daily: Let's talk FPS

When we saw the Call of Duty 4 video, we immediately thought about the possibilities for FPS titles on the DS. Sure, we've received a Quake-style title in Metroid Prime Hunters, but the controls cause our hand to cramp up pretty quickly. We never got a chance to check out Brothers in Arms, but other than that, what is there?

Do you think the system can't possibly expect to see a quality FPS title in its future? Do you think Call of Duty 4 could pave the way for future entries in the genre on the handheld?